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Which feature forms as a result of a tectonic plate boundary that creates an underwater mountain range in the open
ocean?
marsh
trench
abyssal plain
mid-ocean ridge
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SI
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It would be true sodium reacts with water in a violent way 

Answerbonded to an amino group(nh2);

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.